- #1
wasia
- 52
- 0
Hello,
First of all, it is not a homework question, just something I wonder about.
The dominating electron-positron annihilation process at low energies is photon pair creation. What is the angular dependence of the total cross section?
For some reason I expect the head-on collision to have the highest cross-section and the collinear situation to have the lowest cross-section, is it really the case?
I am not a particle physicist, but I expect the calculation to be pretty difficult, involving IR divergences and collinear divergences. Could you give me a reference to the solution of the problem or the experimental results and perhaps give some physical intuition on the whole thing.
Thanks in advance.
First of all, it is not a homework question, just something I wonder about.
The dominating electron-positron annihilation process at low energies is photon pair creation. What is the angular dependence of the total cross section?
For some reason I expect the head-on collision to have the highest cross-section and the collinear situation to have the lowest cross-section, is it really the case?
I am not a particle physicist, but I expect the calculation to be pretty difficult, involving IR divergences and collinear divergences. Could you give me a reference to the solution of the problem or the experimental results and perhaps give some physical intuition on the whole thing.
Thanks in advance.